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1直接法直接法是指直接利用检索工具(系统)检索文献信息的方法,这是文献检索中最常用的一种方法,它又可分为顺查法、倒查法和抽查法。1.1顺查法:指按照时间的顺序,由远及近地利用检索系统进行文献信息检索的方法。这种方法能收集到某一课题的系统文献,适用于较大课题的文献检索。例如,已知某课题的起始年代,
1 direct method Direct method refers to the direct use of search tools (system) to retrieve the literature information method, which is the most commonly used method of document retrieval, which can be divided into Shun law, inverted law and spot checks. 1.1 Subsequent inspection: Refers to the method of retrieving document information by far and near field using the retrieval system according to the time sequence. This method can collect the systematic literature of a certain subject and is suitable for the literature search of a larger subject. For example, knowing the beginning of a certain subject,